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Any suggestions on this one?

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Re: Any suggestions on this one?  [#permalink]

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New post 02 Feb 2019, 21:53
P of raining atleast 3 days out of 5. R is probability it will rain and N is it won't rain
RRRNN or RRRRN or RRRRR
So you just have to add these probablities.
Probability that it will rain is 1/2. No rain is 1/2
(1/2)^5 + (1/2)^5 +(1/2)^5 =3/32

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Re: Any suggestions on this one?  [#permalink]

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New post 02 Feb 2019, 22:09
bellabrown wrote:
If the probability of rain on any given day is 50%, what is the probability that it will rain on at least three days in a row during a five-day period?

A. 3/32
B. 1/4
C. 9/32
D. 5/16
E. 1/2


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Re: Any suggestions on this one?   [#permalink] 02 Feb 2019, 22:09
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